US 6,445,728 B1 · Method of establishing search window size for a mobile station in a cellular system

Abstract

A method of establishing a search window size for a mobile station in a cellular system is disclosed. For the mobile station searching for a pilot signal of base transceiver station (BTS), the information of maximum index being outputted from the mobile station is gathered, wherein the maximum index is an index number at which the strongest signal is detected within a predetermined window size. For the gathered maximum indexes, confidence level is established and mean value is calculated and then confidence interval is calculated for the gathered maximum indexes using the established confidence level and calculated mean value. A maximum offset of the search window to be applied to the present radio morphology of the cellular system is calculated from the calculated confidence interval and a search window to be applied to the present radio morphology is estimated by increasing the maximum offset by two times. Therefore, the present invention is applicable to the characteristic of the mobile station and radio morphology of the cellular system by estimating the search window using the search result data gathered from the mobile station.

Claims7

Dependent claims

A method of establishing a search window size for a mobile station in a cellular system having a present radio morphology, said mobile station being provided with communication services from a plurality of base transceiver stations (BTSs), each of said plurality of BTSs having an inherent pilot signal, said mobile station searching for said pilot signal at each searcher position having a constant time interval within a search window on a time-axis, said method comprising the steps of:

finding a correlation energy value at each searcher position by which a searcher of said mobile station searches for pilot signals received from said plurality of BTSs at each searcher position within a predetermined first search window and outputting a result of the searching;
gathering said result of the searching outputted from said searcher of said mobile station using a diagnostic monitor (DM) connected to said mobile station;
and
estimating the size of a second search window to be applied to the present radio morphology based on the gathered result of the searching and applying the second search window size to said mobile station,
wherein said step of gathering said result of the searching repeatedly gathers a maximum index samples, said maximum index samples including information denoting the location of a particular searcher position from the center of the first search window, and wherein the particular searcher position has the highest correlation energy value within the first search window.

2 more elements

A method of establishing a search window size of a mobile station in a cellular system having a present radio morphology, said mobile station being provided with communication services from a plurality of base transceiver stations (BTSs), each of said plurality of BTSs having an inherent pilot signal, said mobile station searching for said pilot signal at each searcher position having a constant time interval within a search window on a time-axis, said method comprising the steps of:

finding a correlation energy value at each searcher position by which a searcher of said mobile station searches for pilot signals received from said plurality of BTSs at each searcher position within a predetermined first search window;
gathering maximum index samples from said searcher of said mobile station using a diagnostic monitor (DM) connected to the mobile station, said maximum index samples including information which denotes the location of a searcher position from a center of the first search window, the searcher position having the highest correlation energy value within the first search window;
establishing a confidence level value, p, for the gathered maximun index samples;
calculating a mean value, m, and a standard deviation, σ, for the gathered maximum index samples;
calculating a confidence interval for the gathered maximum index samples using the established confidence level value, p, the calculated mean value, m and the standard deviation, σ;
and
estimating the size of a second search window to be applied to the present radio morphology using the calculated confidence interval and applying the estimated second search window size to said mobile station.

4 more elements

Dependencies are inferred from the claim text.

Method of establishing search window size for a mobile station in a cellular system

Life of this patent

Method of establishing search window size for a mobile station in a cellular system

Life of this patent

Abstract

Claims7